There are at least ~ 1500 billion tons of organic carbon in permafrost zone soils, almost twice as much as currently exists in the atmosphere. (searcharcticscience.org)
So many of the fires in this region are already burning in or near permafrost zones. (robertscribbler.com)
Bare peat surfaces in the discontinuous permafrost zone of the sub-Arctic East European tundra. (sciencedaily.com)